1. Does it perform the event( Have you registered the event? ) 2. Do you have an exception? 3. Sorry for bad english
Did you really create two threads with 17 minutes between them? Nice... https://www.spigotmc.org/threads/problem-with-sign-event.237048/
If you already done it, please, put a debug output in some lines of the code to see where's the issue.
